.reader_box {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, .5);

    .reader {
        height: 50%;
        width: 100%;
        position: absolute;
        transform: translateX(-50%) translateY(-50%);
        // background-color: #fff !important;
        top: 20%;
        left: 50%;
    }
}